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JPS57179159

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DESCRIPTION JPS57179159
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a and FIG. 2a are sectional views of a
conventional ultrasonic split probe, and FIG. 1b and FIG. 2 are conventional ultrasonic split
probes. Fig. 3a is a cross-sectional view of the ultrasonic split probe according to the present
invention viewed from the side, Fig. 3 is a cross-sectional view from the front, and Fig. 3C is a
flaw detection waveform. FIG. In the figure, 1 is a transmitting transducer, 2 is a transmitting
delay line, 3 is a receiving transducer, 4 is a receiving delay line, 5 is a first acoustic shield plate,
6 is a probe case, 7 is a shoe, 8 is a test material, 9 is a water film, 10 is a transmission pulse, 11
is a surface penetration echo, 12 is a bottom echo, 13 is a noise echo, 14 is a second acoustic
shield plate, 15 is a plate spring, 16 is a plate spring A probe holder, 17 is a bolt, and 18 is an air
gap. In the drawings, the same or corresponding parts are denoted by the same reference
numerals.
DETAILED DESCRIPTION OF THE INVENTION 635> (1) 177 / '7 This invention relates to the
improvement of an ultrasonic split probe for detecting defects in a test material using ultrasonic
waves. First, a conventional ultrasonic split probe will be described with reference to FIG. 1 (a),
(→ and FIG. 2 (,), (effect). FIG. 1 (→ FIG. 2 (=) is a cross-sectional view of a conventional
ultrasonic split probe, and FIG. 1 (→ FIG. 2 (→ shows a flaw detection waveform (Mskoton chart).
1 (a) and 2 (), (1) is a transmitting transducer, (2) is a transmitting delay line, (3) is a receiving
transducer, and (4) is a receiving delay line, (5) is an acoustic shield plate made of cork material,
(6) is a probe case, (7) is a shoe for forming a water film (9), (8) is a test material, and (9) is a
water film is there. In FIG. 1 (effect, in FIG. 2 (b), ao is a transmission pulse. aD is a surface
penetration echo, a hot water is a bottom surface echo, and as is a noise echo due to the surface
penetration. By the way, the ultrasonic split-type probe usually has a length of about 25 μm
between the damage-in 121 and +41 of the probe and the test material (8) due to the wear of the
probe and the stability of the sound pressure coupling. A gap of about L5 is provided, and a
water film (9) is formed in that portion. The ultrasonic wave emitted from the transmitting
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transducer fil (2) 36 reaches the water film (9) via the transmitting delay and the line (2).
Further, on the surface of the test material (8), the ultrasonic waves transmitted into the inside of
the test material (8) are divided into the reflected ultrasonic waves. The ultrasonic wave reflected
on the surface of the test material (8) is reflected several times in the water film (9) and reaches
the receiving transducer (3) via the receiving delay line-(4), which is the surface Leakage echo a.
In addition, the ultrasonic wave transmitted to the inside of the test material (8) is reflected by
the bottom surface of the test material (8), and again the water film (9) and the receiving side
delay line (41 via the receiving transducer + 31 for reception) Reaching the bottom surface echo
lll. In the case of the conventional ultrasonic split probe, when the surface of the test material (8)
is flat or convex, the flaw detection waveform is shown in FIG. And noise which becomes obstacle
in flaw detection operation appears between 9 surface entanglement echo ■ and bottom surface
echo ■, but when the surface of test material (8) is concave, flaw detection waveform is shown in
Fig. 2 ( As shown in the figure, 1 surface reflection echo ■ level is large 1 surface reflection echo
and bottom surface echo A noise echo positive (3) 37 hour appears between the dead band
which is flaw detection performance, There is a drawback that // I is greatly reduced.
This invention significantly improves such conventional defects, and provides an ultrasonic splittype probe capable of obtaining stable flaw detection performance (particularly, dead zone-9)
without being affected by unevenness of the test material. It is a thing. An embodiment of the
present invention will be described in detail below with reference to #Is diagram (,) (+) (C). Fig. 3
(a) is a cross-sectional view of the ultrasonic split probe according to the present invention as
viewed from the side, Fig. 3 (b) is a cross-sectional view from the front, and Fig. 3 (C) is a flaw
detection waveform ) Shows the figure. 3 (a) (11) (1) is a transmitting transducer, (2) is a
transmitting delay line, (3) is a receiving transducer, (4) is a receiving delay line, (5) is a cork 1st
acoustic shield plate which consists of materials, (6) is a probe case. ()) Is a shoe for forming a
water film (9), (8) is a test material, (9) is a water film, and a4 is a second film made of nylon,
Teflon, metal plate etc. (4) 38 to hold the sound shield plate 2a4) and move the plate up and
down, ae is a probe holder, and a plate is for fixing the plate spring (2). Pol) and al are air gaps
provided between the first acoustic shield plates (5). In FIG. 3 (C), al is a transmission pulse, al is
a surface leak-embedded echo, and a ring is a bottom echo. The second acoustic shield plate of
the ultrasonic split probe according to this invention, α は is the transmission side delay line e)
and the reception side delay line (longer than the length of the ridge, and the test material (8) It
is supported by a leaf spring 4 fixed to the probe holder 1 with a bolt 様 so as to be in a fixed
position in the case of a concave surface. さらに。 There is a space Il 場合 between the sound
shield plate 1 (5), so the second sound shield (heavyweight 4) is the object to be tested. When the
surface of the test material (8) is concave, it is returned upward by the elasticity of the leaf spring
4. As described above, by moving the second acoustic shield plate a4 up and down following the
unevenness of the surface of the test material (8), the delay line (jll, 141 and the test of the
ultrasonic split probe is always detected. Water film (9) of open type (5)% type% of material (8) is
sufficiently covered to prevent remarkable deterioration of flaw detection performance
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(especially dead zone,) 6. 6th, second acoustic shield The plate a4 is supported by a plate spring
(c) and inserted into the space (4) provided in the first acoustic shield plate (5). This is an
advantage that it can be easily replaced even if wear or damage occurs. As described above, this
device uses a plate spring to hold a rigid acoustic shield plate (eg, nylon, Teflon, metal plate)
longer than the length of the delay line of the ultrasonic split probe, and is made of cork material
It is super by inserting empty NK provided between blue tatami shield plates Provided is a
practical ultrasonic split type probe capable of preventing a decrease in flaw detection
performance due to an increase in water film thickness due to a depression of a test material
which is also the largest defect of a wave split type probe. It is.
In the embodiment, the first acoustic shield plate is in the air gap at the opposing surface of the
first acoustic shield plate bonded to the transmission side delay line and the first acoustic shield
plate bonded to the reception side delay line. It is needless to say that the present invention can
be applied even when another solid material is present between the first acoustic shield plate and
the air gap, although it is shown in a state of being in contact with each other.
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